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03-01-2021, 12:51 AM | #1 |
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Transmission Oil
So I'm sure this has been asked a million times (but I couldn't find it)
Is this OK to use in my 1939 flathead 3 speed big truck? https://www.autozone.com/motor-oil-a...art/265000_0_0 Your expertise is always appreciated. Thank you |
03-01-2021, 01:07 AM | #2 |
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Re: Transmission Oil
I’ve often wondered about that too. I don’t see why not.
Just to be safe I use something more like 75/140 in my old transmissions. In souther CA straight 140 should be ok but I think back in the day 90 was used in warm weather and 80 in winter time in cold climates. |
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03-01-2021, 03:10 AM | #3 |
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Re: Transmission Oil
It's fine to use.
I used Amsoil 75-90 Manual Trans oil in mine. |
03-01-2021, 05:54 AM | #4 |
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Re: Transmission Oil
It’s been stated many time here on Barn. Tranny has yellow metals needs to be GL4.
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03-01-2021, 09:53 AM | #5 |
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Re: Transmission Oil
There is no SFE weight mentioned. I would stay away from it and use NAPA SL-24238 140W GL-4
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03-01-2021, 10:05 AM | #6 |
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Re: Transmission Oil
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03-01-2021, 11:14 AM | #7 |
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Re: Transmission Oil
How about the differential fluid type....1934? Thanks
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03-01-2021, 11:21 AM | #8 |
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Re: Transmission Oil
The Sta-Lube that TerryOH pointed out in post #5 is what I use in the gearboxes because it's GL-4. And I use it in the rears too but more for convenience than anything else. I have a '36 and a '35.
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03-01-2021, 01:23 PM | #9 |
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Re: Transmission Oil
A big thanks to all of you!!!
I'll get some NAPA SL-24238 140W GL-4. Something I noticed when I drained the transmission, it seemed to be filled well past the fill hole, and it seemed to be mixed with the corn head grease that I put in the torque tube. Is it possible for the corn head grease to get into the transmission? if so does that mean I'm overfilling the torque tube? |
03-01-2021, 01:35 PM | #10 | |
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Re: Transmission Oil
Quote:
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03-01-2021, 03:19 PM | #11 | |
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Re: Transmission Oil
YES !!!!
If the grease is going forward it probably means your driveshaft seal is working . If it is not the grease usually goes into the torque tube . On cars the spec for filling the u-joint cavity is 4 oz . I just use SAE 140 GL4 in the u-joint , tranny , steering gear and rear end . Works fine if your d-shaft seal is good and the gaskets are installed well . 1933 and 1934 cars . Many seem to think packing the u-joint cavity full of grease is the way to go . The excess is either going in the tranny or rear end . Quote:
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03-01-2021, 03:31 PM | #12 |
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Re: Transmission Oil
You can use GL-4 or GL-5 in the differential because of the lack of "yellow" metal in the rear axle. But, IMO, GL-4 is a better option because: rear axle lube can end up in the transmission, the gear type in the rear axle don't require GL-5 and it's similar to just use the same lubricant in both the transmission and differential.
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03-01-2021, 03:56 PM | #13 |
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Re: Transmission Oil
[QUOTE=1939 Tonner;1990968]A big thanks to all of you!!!
I'll get some NAPA SL-24238 140W GL-4. Yep...Is what I use also.
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Alan 1929 Special Coupe 1941 Pick-Up 1955 Victoria |
03-01-2021, 04:12 PM | #14 |
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Re: Transmission Oil
David J says he uses 140 in everything.
I checked the weather there last month and it was -20f three times when I checked. My brother lives in St Croix Falls. When I lived in River Falls I bought a ‘46 V8 off a used car lot when it was around 20 below zero. After about 50 moles that day the rear end started to howl. The local gas station had to use a blow torch to get the gear oil to drain. I don’t see how he can even steer a car with 140 in the steering gear box. Oh, and another thing; If you put GL5 in a gearbox with yellow metals it will discolor the yellow metals after several years. It will NOT dissolve them in a few minutes like most people believe. |
03-01-2021, 04:38 PM | #15 |
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Re: Transmission Oil
I have mentioned it before, but if you have a Tractor Supply store near you, check them out for trans and rearend oils.
They still carry the Ford tractor transmision oil-- GL-1 for Ford tractors manufactured from 1939-1952. |
03-01-2021, 05:06 PM | #16 | |
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Re: Transmission Oil
Very simple answer .
I do not drive nor start them in cold weather . Summer cars here . The one that gets driven nowdays is a 34 phaeton . Not a cold weather car and it actually still has the straight STP in the steering box Mike ran in FL . That makes SAE 140 look runny . Quote:
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03-01-2021, 05:18 PM | #17 |
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Re: Transmission Oil
If you put GL5 in a gearbox with yellow metals it will discolor the yellow metals after several years. It will NOT dissolve them in a few minutes like most people believe.
This I agree with. |
03-01-2021, 07:17 PM | #18 |
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Re: Transmission Oil
Well Im bucking the trend on this one . Ive gone away from using GL4 and have started using the Penrite 85-140 mineral gear oil GL5. They have an additive which is "supposed too be" safe[ish] . Time will tell. Pretty sure Lawrie has just been using "standard type" gear oils without detrimental effects. I believe the damage come mostly when the oil becomes hot. Most of my driving is back and forth too work so thats not an issue.
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03-01-2021, 09:01 PM | #19 | |
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Re: Transmission Oil
Quote:
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03-01-2021, 09:44 PM | #20 |
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Re: Transmission Oil
here the GL4 is hard to come by and expensive
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